Lubricating system



' C. A. PARSONS ET AL LUBRICATING sYsTEM Filed Sebt. 21. 1921 E ii. 16

3) INVEN'TO e5 CHMLES 4 24mm; 5TANLEY ()QOKI Lows M- 0006); 1 fW WMSWMMMr fi h:

Patented Aug. 14, 1923,

*- umani T- team PATENT OFFICE.

enem es n Iieiaialvo reasons, STANLEY SMITH COOK, AND LOUIS MORTIMERDOUGLAS, or NEwoAsrLn-UroN-rYNn, ENGLAND; SAID COOK AND SAID DOUGLAS 1essIe ons TO SAID PARSONS.

' which the following is a specification. I

The presents invention relates'to systems such, for example, as thosedescribed. in British patent application No. 18024 of 1919, in which acommon pumpJiS employed to pump oiljthroughytwojor more paths; In

such installations, where oil coolers are arranged in parallel in.diiferent paths the coolers are so designed that in addition toreducing the temperature of the oil bythe .desired amount they; opposesuchrelative resistance to the flowof the oil as to obtain the proper.relation between the quantities of oil passing through the respectivecoolers,

that is tosay, with the required pressures at their outlets. p

It has been found in practice, however,

quantities are not-es designed or required; :and the resistances to flowthrough the coolrers are liable tovary owing to variationin the qualityand condition of theoil, or, most importantof all, owing'to choking. f-.The object of the. present inventionis to ensure that therelationbetween the quantities passingthrough the: two coolers will beautomatically maintained irrespective of the resistances of the coolers.

V The invention consists in the employment in the oil circulating systemof a piston valve which is responsive tothe pressure of the oil in thedischarge-from each cooler and is so actuated that when the pressure inthe discharge fro-m one cooler falls. below the pressure in thedischarge from the other cooler,

the supply. in the latter cooler is restricted, while the'supply to theformer is increased.

The invention further consists in con: .structing the valve in such amanner that when the supply to one cooler has been restricted' to apredetermined extent, any furthermovement causing further restriction ofthis supply will causethe other cooler to be by-passed, so that in theevent of com- 'LUBRICATING SYSTEM.

Application-filedSeptember 21,1921. Serial No. 502,199. 7

plete or very considerable choliing of either or bothcoolers, either orboth of them will be automatically by-passed and a proper quantity ofoil supplied to the system.

'lhe mventlon further consists in the im-. proved means for controllingtheflow of oil in lubricating systems hereinafter described. 7'Referr1ng to the accompanying draw 1ngs:

Figure 1 is a longitudinal I section of the valveindicatmgdiagrammatically the pipe connections to the coolers.

Figure 2 illustrates a modified form of valve. 7 i 1 Figure-3 is afragmentary cross-section on the line AA of Figure 2,

In carrying the invention into effect according to the example shown inFigure 1, in which a common pump delivers oil to two different systemsthrough two coolers l and 2, in. parallel, there is provided a valvecomprising two pistons 3 and 4 of the same di ameter connectedby a" stem5, which valve can slide freely in a cylindrical casing l 6. 011 fromthe pump is admitted by an inlet 7 v ito thecentral portion of thecasingbetween that through-yarious causes these relative the pistons 3 and 4and passed to the coolers through apertures S and 9 in the centralportion of the oasing. Oneaperture 8 or set of apertures is partiallycovered by the left hand piston 3 and leads to the cooler 1,while theother aperture 9 or set of apertures is "the valve because the pistonsare of the same area, but difierence in the pressuresacting on its outerends, that is, difference in the pressuresflat the cooler outlets,causes the valve to move towards the low pressure end. If

the quantity of oil received by one system, say, that supplied throughcooler 1, is defective, the pressure at the outlet of this cooler willfall and the higher pressure in the outlet from cooler 2 will move thevalve partially covered by the right hand piston and the variation willproceed until the outnormal position.

let pressures from the two coolers are again equal. it. detective supplythrough the cooler 2 would, or course, be rectified by the valve movingin the reverse direction.

The apertures S and 9 maybe made of any shape but are preferably of suchform as to give a large movement'tothe valve and of such area that thepressure drop across them is small when the valve is in the The pistonsare provided withby-pass apertures/bland 15 leading from the centralspace between the pistons through the cylindrical" surfaces ozt'thepistons. *Each by-pass aperture is normally coveredby the cylindercasing butis so disposed in relation to a recess 16' o'rl? in thecylinder casing that when the inlet aperture to one cooler has beenrestricted to a predetermined extentby one piston, the bypass aperturein the "other piston is over the recess which communicates with theoutlet from the other cooler whereby the latter cooler is by-passed. Themovementoft the valve either direction ispret'erably limited by stops 18so disposed that when the piston reaches them the by-pass aperture issufiiciently'uncovered "to pass thetotalquantity required for the systemwhose cooler has been choked.

7 If desired a light spring or springs may be provided to assist inbringing theva'lve to the normal position and to prevent jerkinessinaction. i V V In the event of obstruction occurring in both coolerssimultaneously, it would not be possible by means merely of theapertures 14 and 15 to by-pass both coolers, and hence. the, supply of"oil to oncoi the lubrieating systemsmight fail. In order to'meot suchan eventuality the pistons are arranged to be movable on the spindle 5,the normal distance between them being determined by flanges 30 and3liformed on the spindle 5.

In the ordinary working of the apparatus,

the pistons are maintained in contact with V 33, which are compressed bynuts 84 and 85 and washers 36, 37 fitted on the outer end of the spindle5. In the event of both coolers becoming simultaneously choked orabnormally obstrueted,'the pressure at both'ends of the cylinder 6 willbe reduced, with the result that one or both pistons will slide alongthe spindle 5 against the action of the springs 32 and 33, thuspermitting oil simultaneously to flow through the apertures 1d and '15,ensuring a simultaneous supply to both lubricating systems, both coolersbeing bypassed.

It will be seen that the springs and 33 might be replaced by' a singletension spring, spaced between the ia'omana connected to. both of them.Further, it .is pos sible to dispense entirely with the spindle 5, thespring acting as the sole connection between the pistons and being ofsuilicient strength to ensure that under normal conditions supplythrough the apertures 14- and '15 will not occur simultaneously.

In the modification illustrated in Figures l 2 and 3, annularspacesSSand 3amm vided between the pistons and the spindle 5, so thatimmediately either piston is forced out of contact with itscorresponding flange 30 or '31, the supply of oil occurs to'one of thelay-passes l0 or'll through theannular space and an aperture 40 or 41leading from it to the space a t the outer end of'the'corresponding!Piston} It will be seen that the invention-is alsoapplicable to installationsin which the resistance to flow throt onesystem is very small in relation to that-through the other system, as,for instance, when acooler is provided in one of the paths only. In suchcases the valvewill automatically maintain such resistance to flowthrough the system without a cooler 'a's to maintain equal'oil pressuresin'the two systems supplied-.-

The control valve maybe designed insev eral ways to give dififerentdischarge pressures; For instance, one, of the piston ends may bestepped and the annular spacesbetween the steps connected to atmosphere,or the differencein pressure may be obtained "by "causing a" spring of'suflic ient strength to act on one end of the valve or the. valve maybe plac e dfve1ftically and made of sufficient we ght to cause thedifference in pressure required.

' l-laving'now described our invention, what we claim" as new and desireto secure by Letters Patent is 1. A distributing valve comprising incombination "a casing, two pistons fitting within said casing, saidpistons being mounted on a common spindleso asto be capable of slidingalong said spindle, and J-yi'eldable means tending "to force saidpistons" together.

2. A distributing valve comprising in combination a casing, two pistonsfitting within casing, said pistons being mounted on a common s'pindlesoas to be capable of sliding along saidspindle, "yieldable and flanges onsaid spindleto limit'theim ward motion of said" pistons.

3. A distributing valve comprising in means tending to foreesaid pistonstogether combination a casing, two pistons fitting limit the inwardmotion of said pistons and Within said casing, said pistons beingmountto close said by-passes. ed on a common spindle so as to be capa-In testimony whereof We have signed our 1 ble of sliding along saidspindle, yieldable names to this specification. .5 means tending toforce said pistons to- CHARLES ALGERNON PARSONS.

gether, by-passes between said pistons and STANLEY SMITH COOK. saidspindle and flanges on said spindle to LOUIS MORTIMER DOUGLAS.

